Into which layer of the atmosphere are jetplanes able to travel?

Jet planes typically operate in the lower to middle part of the stratosphere, at altitudes ranging from about 30,000 to 40,000 feet (approximately 9,000 to 12,000 meters). This layer is above the troposphere, where weather occurs, and provides a more stable atmosphere with less turbulence, allowing for efficient long-distance travel. Some specialized aircraft may even reach the lower levels of the mesosphere, but this is less common for commercial aviation.